Supergirl is the superhero identity of Kara Zor-El, Superman’s younger cousin from the planet Krypton. In DC stories, she is portrayed as a powerful ally of Superman, sharing many of his abilities under Earth’s yellow sun, including flight, super strength, heat vision, and invulnerability. She often serves as a symbol of hope, resilience, and youthful determination, while also exploring themes of identity, loss, and belonging as a Kryptonian living on Earth.